fix: install gcc by hand

[software-dov]

Preliminary fix for broken unit tests in protobuf dependency update

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@481975e). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master      #571   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?        26           
  Lines             ?      1508           
  Branches          ?       308           
==========================================
  Hits              ?      1508           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ
gapic/utils/code.py	100.00% <0.00%> (ø)
gapic/schema/wrappers.py	100.00% <0.00%> (ø)
gapic/samplegen_utils/yaml.py	100.00% <0.00%> (ø)
gapic/utils/lines.py	100.00% <0.00%> (ø)
gapic/utils/cache.py	100.00% <0.00%> (ø)
gapic/utils/doc.py	100.00% <0.00%> (ø)
gapic/samplegen_utils/utils.py	100.00% <0.00%> (ø)
gapic/samplegen/__init__.py	100.00% <0.00%> (ø)
gapic/samplegen/samplegen.py	100.00% <0.00%> (ø)
gapic/samplegen/manifest.py	100.00% <0.00%> (ø)
... and 16 more

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